function load(el) {
      var row1 = document.getElementsByClassName('row1');
      var row2 = document.getElementsByClassName('row2');
      var row3 = document.getElementsByClassName('row3');
      var startBtn = document.getElementById('start');
      var stopBtn = document.getElementById('stop');

      var elements = [row1,row2,row3];
      var width = 66 + 'px';

      for(var i = 0; i < elements.length; i++){
            for(var j = 0; j < 3; j++){   
                  elements[i][j].style.width = width;
                  elements[i][j].style.height = width;
                  elements[i][j].style.position = "absolute";
                  elements[i][j].style.left = (10 * (j + 1) + j * parseInt(width)) + 'px';
                  elements[i][j].style.top = (10 * (i + 1) + i * parseInt(width)) + 'px';
             }
      }
 
      startBtn.style.left = parseInt(elements[2][0].style.left) + 30 + 'px';
      startBtn.style.top = parseInt(elements[2][0].style.top) + parseInt(width) + 30  + 'px';
      stopBtn.style.left =  startBtn.style.left;
      stopBtn.style.top = 44 + parseInt(startBtn.style.top) + 30 + 'px';
      
      var setinterval;
      var off = 0;
      startBtn.onclick = function(e) {
            if(off === 1) return;
            setinterval = setInterval(function() {
            var i =  Math.round(Math.random() * 2);
            var j =  Math.round(Math.random() * 2);
            elements[i][j].style.background = color();
           },100);
           off = 1;
      };

      stopBtn.onclick = function(e){
            off = 0;
            clearInterval(setinterval);
      };

      function color(){
            var color = '#';
            var arr = ['0','1','2','3','4','5','6','7','8','9','a','b','c','d','f'];
            for(var i = 1; i < 7; i++){
               color+=arr[Math.round(Math.random() * (arr.length - 1))];
            }
            return color;
      }
      
}

